Wonder Boy in Monster World, known in Japan as Wonder Boy V: Monster World III, is a side-scrolling action RPG originally developed by Westone Bit Entertainment and published by Sega for the Mega Drive/Genesis in 1991. It is the fifth game in the Wonder Boy series and the third game in the Monster World sub-series, following Wonder Boy in Monster Land (Super Wonder Boy: Monster World on the Japanese Sega Mark III) and Wonder Boy III: The Dragon's Trap (Monster World II: Dragon no Wana on the Japanese Game Gear). It was also the last Wonder Boy game that was given an official English release, until the Wii Virtual Console release of Monster World IV in 2012.
Versions for other platforms were also made. In 1993 Sega released a Master System version of the game specifically for the European market, while in 1994 Hudson Soft remade the game for the PC Engine under the title of The Dynastic Hero (超英雄伝説ダイナスティックヒーロー Chō Eiyū Densetsu Dainasutikku Hīrō?), featuring an all-new theme and cast of characters. In 2007, the Mega Drive version was re-released on the Wii Virtual Console download service.
Wonder Boy In Monster World puts you in control of Shion in his quest to save Monster World from the evil BioMeka. It controls like your standard platform game: run, jump, crouch, and kill enemies. The game is filled with Adventure elements close to the ones in The Legend of Zelda such as talking to townsfolk, collecting money to buy items, extending your life bar by collecting hearts, and equipping a large variety of armor, weapons and magic.
Shion travels through the many interconnected regions of Monster World, all the while collecting increasingly powerful equipment in the form of many different swords, spears, shields, suits of armor, and boots.
The game introduced a one slot save feature to save progress at inns throughout the game world. In the Japanese original Shion returned to the inn last saved at upon death (and was charged its fee accordingly), so returning to an inn in order to save is a simple matter of allowing Shion to be killed. In the English-language Mega Drive versions this was changed to a "Game Over" screen; this made it often tedious to return to the inns early in the game when Return magic hadn't been obtained yet.
Plot: "Monster World was once a peaceful region. Then, the peace was shattered by an invading army of monsters. A young man named Shion vowed to defeat them and make his land peaceful again."
During his travels, Shion will often be joined by a small companion who follows you around. Each companion is bound to the region he or she belongs to, and will return to their respective homes when you leave said region. All travel companions will also temporarily stay out of action during boss fights.